chore: absolute host volume path

.drone.yml

@@ -23,4 +23,4 @@ steps:
 volumes:
 - name: dist
   host:
-    path: ~/docs.hmcl.net
+    path: /home/ubuntu/docs.hmcl.net

Gemfile

@@ -1,4 +1,4 @@
-source "https://rubygems.org"
+source "https://gems.ruby-china.com"
 # Hello! This is where you manage which Jekyll version is used to run.
 # When you want to use a different version, change it below, save the
 # file and run `bundle install`. Run Jekyll with `bundle exec`, like so: